John Archibald Campbell QC (April 19, 1872 – November 26, 1963) was a politician in Manitoba, Canada. He served in the Legislative Assembly of Manitoba from 1907 to 1910, as a member of the Manitoba Liberal Party and then in the House of Commons of Canada from 1917 to 1921 as a member of the Unionist Party. In 1919, he married Elsie M. Thompson. Campbell was defeated in the 1910 election, losing to Harvey by 53 votes. He sought a return to the legislature in the 1914 election, but lost to Conservative candidate Joseph Hamelin by sixty votes in the neighbouring constituency of Ste. Rose.